function openWindow(url, name, width, height)
{  if (url != '')
   {  var config = 'toolbar=no,location=no,directories=no,status=no,scrollbars=yes,resizable=no,copyhistory=no,titlebar=no,';
      var x = (screen.availWidth - width) / 2;
      var y = (screen.availHeight - height) / 2;
      if (x < 0) x = 0;
      if (y < 0) y = 0;
   
      if (document.layers)
      {  config = config +',innerWidth='+ width;
         config = config +',innerHeight='+ height
         config = config +',screenX='+ x;
         config = config +',screenY='+ y;
         window.open(url, name, config);
      }
      else
      {  config = config +',width='+ width;
         config = config +',height='+ height;
         config = config +',left='+ x;
         config = config +',top='+ y;
         var popup = window.open(url, name, config);
      }
      return false;
   }
}